Bulletin of the Institute of Tropical Agriculture, Kyushu University
Online ISSN : 1881-4212
Print ISSN : 0915-499X
ISSN-L : 0915-499X
Combining ability and heterosis in inter-ecotypic classes of rice (Oryza sativa L.)
B. P. RayS. K. SarkerM. SarkerS. Saha
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2014 Volume 37 Issue 1 Pages 27-39

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Abstract

An experiment of six-parent half diallel analysis on rice (Oryza sativa L.) was conducted to evaluate the combining ability and heterosis for 14 yield and yield contributing characters. The analysis of variances indicating the genotypes differed for all the traits studied. The ratio of general combining ability (GCA) and specific combining ability (SCA) variances for most of the characters revealed the predominance of additive gene action over non-additive. The Boro variety, BRRI Dhan29, revealed GCA effects for most of the important characters and BRRI Dhan36 also revealed good GCA effect for plant height, effective tiller/plant, panicle weight, number of primary branch/panicle, 1000 grain weight, grain yield/plant and harvest index. The Aus×Boro crosses, BR21 BRRI Dhan29, BR21 BRRI Dhan36, BR24 BRRI Dhan29 and BR26 BRRI Dhan29 were observed with considerable significant SCA effects and selected for grain yield/ plant and important yield contributing characters. Out of fifteen crosses, an Aus×Aus cross, BR24 BR26 expressed desirable heterosis for panicle length, panicle weight and secondary branch/panicle. Boro×Boro crosses, BRRI Dhan29 BRRI Dhan36 and BRRI Dhan28 BRRI Dhan29, were favorably heterotic for days to maturity; BRRI Dhan28 BRRI Dhan36 for panicle length, filled grain /panicle and grain yield/plant; BRRI Dhan28 BRRI Dhan29 and BRRI Dhan28 BRRI Dhan36 for panicle weight; BRRI Dhan28 BRRI Dhan36 for grain yield /plant. The combination BR21 BRRI Dhan29 showed desirable heterosis for days to 50% flowering, days to maturity, grain yield/ plant and harvest index; BR21 BRRI Dhan36 for plant height, panicle length, and grain yield/plant; BR24 BRRI Dhan29, BR26 BRRI Dhan29 and BR21 BRRI Dhan28 for days to maturity.; BR24 BRRI Dhan36 and BR26 BRRI Dhan36 for panicle length, number of filled grain/panicle and grain yield/ plant; BR26 BRRI Dhan29 for panicle weight; BR24 BRRI Dhan36 showed for thousand grain weight. For grain yield/ plant the cross BR26 BRRI Dhan36 was the best heterosis followed by BR26 BRRI Dhan29, BR21 BRRI Dhan36, BR24 BRRI Dhan36, and BR21 BRRI Dhan29. Combinations of BRRI Dhan29 and BRRI Dhan36 with other parents were showed better heterosis for overall performance.

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© 2014 Institute of Tropical Agriculture Kyushu University
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